How to Get Files and SubFolder Names under a FTP Folder in c# or Vb.net for an Windows application?

using System.IO; //import namespace
----------------
----------------
            List<string> obj=new List<string> ();
            DirectoryInfo info = new DirectoryInfo(Server.MapPath("directory path"));//specify directory path
            foreach (var item in info.GetFiles())
            {
                obj.Add(item.Name);
            }</string></string>